Telephone line monitor Circuit Diagram

Telephone line monitor Circuit Diagram

This chic little circuit lets you almanac your buzz conversations automatically. The accessory connects to the buzz line, your band recorder's microphone input, and the recorder's alien ascendancy jack. It senses the voltage in the buzz band and begins recording back the band drops to 5 volts or less.

Parts
R1 270K 1/4 W Resistor
R2 1.5K 1/4 W Resistor
R3 68K 1/4 W Resistor
R4 33K 1/4 W Resistor
C1 0.22uF 150 Volt Capacitor
Q1, Q2 2N4954 NPN Transistor
D1 1N645 Diode
MISC Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug

Notes
1. The circuit can be placed anywhere on the phone line, even inside a phone.
2. Some countries or states require you to notify anyone you are talking to that the conversation is being recorded. Most recoders do this with a beep-beep. Also, you may have to get permission from the phone company before you connect anything to their lines.